In all seriousness, though, the fact that racial divides exist within every subgroup is a given. Yeah, I'd rather it not be so, and to a degree some of these divides have been bridged. Music happens both in spite of and because of this divide.
So jazz/creative music/improvisation is not wholly embraced by African-Americans, and I suspect it's for the same reason it's not wholly embraced by most of society. In other words, it is uncommercial. Again, a given, and we go from there...